acceptor impurity

17 LETTERS · STARTS WITH A

acceptor impurity is a valid 17-letter word worth 29 points in Scrabble and 34 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

A1C3C3E1P3T1O1R1I1M3P3U1R1I1T1Y4

1 + 3 + 3 + 1 + 3 + 1 + 1 + 1 + 0 + 1 + 3 + 3 + 1 + 1 + 1 + 1 + 4 =29 PTS

DOUBLE WORD → 58TRIPLE WORD → 87

MEANING

What does acceptor impurity mean?